js-on-sx: js-new-call honours function-typed constructor returns

new Object(func) should return func itself (per ES spec - "if value
is a native ECMAScript object, return it"), but js-new-call only
kept the ctor's return when it was dict or list — functions fell
through to the empty wrapper. Added (js-function? ret) to the
accept set.
built-ins/Object: 42/50 → 44/50. conformance.sh: 148/148.

lib/js/test262-scoreboard.md

@@ -1,28 +1,24 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 224.9s
+Wall time: 42.1s
 
-**Total:** 78/99 runnable passed (78.8%). Raw: pass=78 fail=15 skip=1 timeout=6 total=100.
+**Total:** 44/50 runnable passed (88.0%). Raw: pass=44 fail=6 skip=0 timeout=0 total=50.
 
 ## Top failure modes
 
-- **13x** Test262Error (assertion failed)
-- **6x** Timeout
-- **1x** ReferenceError (undefined symbol)
-- **1x** SyntaxError (parse/unsupported syntax)
+- **4x** ReferenceError (undefined symbol)
+- **2x** SyntaxError (parse/unsupported syntax)
 
 ## Categories (worst pass-rate first, min 10 runnable)
 
 | Category | Pass | Fail | Skip | Timeout | Total | Pass % |
 |---|---:|---:|---:|---:|---:|---:|
-| built-ins/String | 78 | 15 | 1 | 6 | 100 | 78.8% |
+| built-ins/Object | 44 | 6 | 0 | 0 | 50 | 88.0% |
 
 ## Per-category top failures (min 10 runnable, worst first)
 
-### built-ins/String  (78/99 — 78.8%)
+### built-ins/Object  (44/50 — 88.0%)
 
-- **13x** Test262Error (assertion failed)
-- **6x** Timeout
-- **1x** ReferenceError (undefined symbol)
-- **1x** SyntaxError (parse/unsupported syntax)
+- **4x** ReferenceError (undefined symbol)
+- **2x** SyntaxError (parse/unsupported syntax)